fix(ui): add error handling to sign-out

Add try/catch with toast notification for sign-out failures.

src/components/sign-in.tsx

@@ -3,15 +3,19 @@
 import { signOut, useSession } from "@/lib/auth-client"
 import { Button } from "@/components/ui/button"
 import { useRouter } from "next/navigation"
+import { toast } from "sonner"
 
 export default function SignIn() {
   const { data: session, isPending } = useSession()
   const router = useRouter()
 
   const handleSignOut = async () => {
-    await signOut()
-    router.push("/")
-    router.refresh()
+    try {
+      await signOut()
+      router.push("/")
+    } catch (error) {
+      toast.error("Failed to sign out. Please try again.")
+    }
   }
 
   if (isPending) {